THE UP DOWN-RECKONING METHOD ON NON -ABACUS AND THE UP DOWN-RECKONING TOOL

摘要

PURPOSE: a kind of up down calculates that tool is provided to enable user to readily implementing four basic arithmetical operations without calculating on an abacus. ;CONSTITUTION: being firstly added the stage, and number is arranged on each numerical digit. Airtight second is added the stage, and add operation is accelerated and the first number of stages to execute from more seniority top digit. First multiplied by the stage, multiplied result number is placed on each finger from higher to the numerical digit of lower number. Airtight second multiplication stages, if the result being multiplied is more than 10, it is converted into 1 and is added to higher number. ;The 2011 of copyright KIPO submissions